• Title/Summary/Keyword: Large-scale system

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A Study on Information Strategy Development Using Configuration Management in Large-scale Construction Project (형상관리기법을 활용한 대형 프로젝트 정보화 전략개발)

  • Won, Seo Kyung
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.66-67
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    • 2018
  • Large-scale construction projects require various license and technologies for the manufacturing and handling processes. Also, the whole life cycle business process management determines the success of the project. Then, the efficiency of the business conducted by stakeholders and their possessed technology should be enhanced in order to strengthen their competitive power. For this reason, many experts pointed out to focus on the improvement of the life cycle process and efficient management. Since it is very important to keep up-to-date data and utilize it for work during the long-term project to reflect changes in the large-scale project, the most important part of the project management in project is information change management. Therefore, the objective of this study is applying configuration management(CM) technique in order to managing change data generated for planning in early phase. The result of this research will certainly assist the large-scale project managers in the development of information change management system.

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Design of a Small-Scale Motor-Generator System for a Large Wind Turbine (대형 풍력발전기용 소형 모터-발전기 시스템 설계)

  • Lim, Chae Wook
    • The KSFM Journal of Fluid Machinery
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    • v.20 no.1
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    • pp.48-52
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    • 2017
  • Small-scale motor-generator sets have been used in laboratories for verification of real large wind turbines whose rated power are more than 1 MW. In this paper, a result of designing a small-scale motor-generator system, which is composed of motor, gear box, flywheel, and generator, is presented in the aspect of speed response. Design objective is to make a small-scale motor-generator system have the same time constant and optimal tip speed ratio region as a real MW wind turbine. A small-scale 3.5 kW motor-generator system for emulating response of a 2 MW wind turbine is considered and designed.

Decentralized Load-Frequency Control of Large-Scale Nonlinear Power Systems: Fuzzy Overlapping Approach

  • Lee, Ho-Jae;Kim, Do-Wan
    • Journal of Electrical Engineering and Technology
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    • v.7 no.3
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    • pp.436-442
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    • 2012
  • This paper develops a design methodology of a decentralized fuzzy load-frequency controller for a large-scale nonlinear power system with valve position limits on governors. The concerned system is locally exactly modeled in Takagi-Sugeno's form. Sufficient design condition for uniform ultimate boundedness of the closed-loop system is derived based on the overlapping decomposition. Convergence of all incremental frequency deviations to zero is also investigated. A simulation result is provided to visualize the effectiveness of the proposed technique.

Evaluation of Thermal Environment through Large-scale Model Experiment on Air-barrier Type Perimeter-less System (실대실험에 의한 에어베리어형 페리미터레스 공조시스템의 실내 열환경 평가)

  • 김용경;이정재
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.11
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    • pp.970-978
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    • 2003
  • This paper aims at suggesting design guidelines for a perimeter-less HVAC system that contributes energy savings. Perimeter-less HVAC system is one that relieves difficulties such as handling mixing loss, uneven radiative environment, and maintenance and repair. It prevents heat load gained through window and outdoor wall without modifying a previously equipped building skin system. In this paper, we conducted a large-scale model experiment to see how the push-pull air flow would handle indoor heat to obtain an optimized perimeter-less design, and then we plan to perform several kinds of CFD (computational fluid dynamics) cases through numerical simulation

Optimal output feedback design for discrete large scale systems with two time-scale separation properties

  • Jin, Jong-Sam;Kim, Soo-Joong
    • 제어로봇시스템학회:학술대회논문집
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    • 1987.10b
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    • pp.203-208
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    • 1987
  • Design problem of output feedback controllers for discrete large scale systems using simplified model is investigated. It is shown that neglecting fast modes does not generally guarantee the stability of the closed loop system. In this paper, the design procedure is proposed to stabilize the system by minimizing a quadratic cost function for the simplified model and a measure of stability for the neglected fast model.

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Critical Contingency Analysis for a Short-term System Operation Planning in Korea (우리나라 단기계통운용계획을 위한 가혹 상정고장 분석)

  • Lee, Jeobng Ho
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.54 no.11
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    • pp.507-517
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    • 2005
  • This paper presents the results of critical contingency analysis for the Korean power system which is performed to identify the impact of the critical contingencies on the Korean power system and set up a short term system operation planning for the purpose of preventing large scale blackout. The static and dynamic simulation is carried out for each critical contingency and the simulation results for each contingency are shown under the peak load condition for the year 2005, 2007 and 2010.

A Study on the Large-scale Adoption Method of Distribution System Interconnected with PV System by Energy Storage System (전기저장장치를 이용한 태양광전원이 연계된 배전계통 수용성향상 방안에 관한 연구)

  • Nam, Yang-Hyun;Choi, Sung-Sik;Kang, Min-Kwan;Lee, Hu-Dong;Park, Ji-Hyun;Rho, Dae-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.8
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    • pp.1031-1039
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    • 2018
  • If large-scale PV systems are continuously interconnected to distribution system, customer voltages could violate the allowable voltage limit($220{\pm}13V$) according to reverse power flow of PV system. In order to solve these problems, this paper proposes flexible adoption evaluation algorithm of PV system in distribution system which estimates proper introduction capacity and location of ESS(energy storage system) for keeping customer voltages within allowable voltage limit based on various operating scenarios related with connecting point and capacity of PV system. And also this paper proposes modeling of ESS, SVR(step voltage regulator) and PV system using PSCAD/EMTDC S/W and analyzes characteristics of customer voltages and the adoption ability of PV system in distribution system. From the simulation results, it is confirmed that proposed algorithm is useful for large-scale adoption of PV system in distribution system to maintain customer voltages within allowable voltage limit.

Study on the Application of Decentralized Control Method for Simplified Model of Deep Seabed Mining System (심해저 채광시스템의 단순 모델에 대한 분산 제어 기법 적용성 연구)

  • YEU TAE-KYEONG;HONG SUP;KIM HYUNG-Woo;CHOI JONG-SU
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2004.11a
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    • pp.73-78
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    • 2004
  • The deep seabed mining system is generally composed of surface vessel, lifting system, buffer, flexible pipe and miner. The milling system is regarded as a large-scale system in which each subsystem is interconnected to other one. In order to control a large-scale system, a decentralized control approaches have been proposed recently. In this paper, as a basic study on application of decentralized control, firstly, the mining system is simplified modeled, where the lifting system and buffer is regarded as a spherical pendulum and tile flexible pipe is as a two-dimension linear spring. Based on the derived model, the system characteristics and the feasibility of decentralized control are analyzed.

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A Study on the Customer Voltage Characteristic of Distribution System with Large Scale PV (대용량 태양광발전이 연계된 배전계통의 수용가 전압 특성해석에 관한 연구)

  • Kim, Byung-Ki;Ryu, Kyung-Sang;Kim, Chan-Hyeok;Rho, Dae-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.1
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    • pp.29-36
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    • 2013
  • This paper deals with the analysis of the customer voltage characteristic in distribution system interconnected with large scale PV system. There would be many power quality issues which are caused by reverse power flow of PV system interconnected with distribution system. In order to analyze the effect of PV system on the customer voltage, detailed modeling method of distribution system and modified modelling method of PV system are proposed using PSCAD/EMTDC in this paper. So far, less than dozens KW of PV system can be simulated with the existing modelling method. Therefore, a new modeling method which can simulate the large scale PV system is proposed by considering the relationship equation on the phase and voltage in the current control algorithm. From the simulation result of proposed modelling method, it is confirmed that an optimal operation method in distribution system is suggested by analyzing the effect of PV system on customer voltage.

A Study on Development of Monitoring System for Precise Consturction of Large Scale Prestressed Concrete Bridges (PC장대교량의 정밀안전시공을 위한 시공계측관리시스템의 개발에 관한 연구)

  • 오병환;김의성;최인혁;양인환
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.10a
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    • pp.520-525
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    • 1996
  • Recently, the prestressed concrete long-span bridegs are increasingly built at various locations in the world. The mechanical and structural behavior of prestressed concrete bridges is very complex because of nonlinear and time-dependent material behavior and sequential change of structural system due to stepwise construction. These factors may cause construction errors with respect to design value and monitoring system is needed to minimize or to protect construction errors. This study presents the basis development of monitoring system for precise construction of large scale prestressed concrete bridges.

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